Steam boiler



Aug. 23,1927. n l

C. H. HAAs. ET AL STEAM BOILER .FiledvMaroh 4, 1927 2 sheets-sheet i46). 113,152 llt/$55150;

Patented Aug. 23, 1927.

UNITEDy STATES CLARENCE HTHAAS AND LEWIS J. MITCHELL, OF WARREN, OHIO.

STEAM BOILER.

Application filed March 4, 1927. Serial No. 172,759.

The present invention has relation to improvements in steam boilers.

An object of the invention is to direct the flame and other products ofcombustion against the inner surface of the boiler` to retard them intheir passage through the same, thus greatly increasing the steamingqualities of the boiler.

lThe nature of the invention consists in spirally arranged difl'users orbaille plates in the form of pins and corrugations or ribs so as tocause the products of combustionto pass upwardly in a spiral course.

Another important object of the invention Vlies in the provision of aheater characterized by its inherent simplicity and low cost ofconstruction, and by the fact that it contains a minimum number of partsapt to get out of order from corrosion or otherwise and by the fact thatit contains no internal pipe liable to become foul.

l@Vith the above and numerous other objects in view, as will appear asthe description proceeds, the invention resides in certain novelfeatures of construction, and in the combination and arrangement ofparts as will be hereinafter more fully described and claimed.

In the drawing:

Figure 1 is a vertical sectional view through the structure embodyingthe features of our invention,

Fig. 2 is an enlarged detail sectional elevation thereof,

Fig. 3 is a horizontal section taken substantially on the line 3 3 ofFig. 2,

Fig. 4 is an enlarged detail elevation of the ribs or corrugations.

Now having particular reference to the drawings, our novel boilerconstitutes the provision of an open-ended cylindrical shell 5 ofdesired capacity that is provided at its upper end with a conventionalform of head 6 within which is an enlarged central opening 7.

lVithin the shell 5 at the lower end thereof is an interior-,shell 8functioning as the fire box for the boiler.v This shell is also ofcylindrical formation, being open at its opposite ends and is of slighlyless diameter than the diameter of the outer shell 5 providing a waterspace there-between. The lower end of this interior shell 8 is flaredoutwardly at 9 that serves as the bottom wall of the boiler whiledepending therefrom is a skirt 10 that closely engages the interior ofthe shell 5 and is suitably secured thereto. The upper end of theinterior shell 8 is provided with a conventional head 12 that is alsoformed with a central circular opening 13 in registration with theopening 7 of the head 6, and within which is arranged one end of a.relativelv wide cylindrical flue pipe 14, the other end thereof Theupper head 17 7 of the drum 15 and the tube 19 there are disposedannular ribs 20. These ribs 20 are preferably formed integral with thedrum land the tube 19. These ribs are formed in sections as is moreclearly illustrated in Fig. 4l so as to provide spirally arranged spaces21 in which are received spiral fins 22. The spiral fins 22 are widerthan the ribs 20 as is clearly illustrated in both Figs. 1 and 2. Thesefins 2O may actually catch the interior surfaces of the interior shell 8and the flue pipe 111 if desired and as shown in the drawing. It is tobe noted that the spiral of the fin about the tube 19 is opposite tothat about the drum.

From the above detailed description it will be seen that the ribsfunction as ballles to retard the llame, smoke, and other products ofcombustion in their spiral path caused by the spiral fins 22 about tliedrum 15 and the tube 19. In this way the maximum heat is obtained fromthese p roducts of combustion. Thus the boiler' will be capable o feconomical operation and maximum etliciency.

It is thought that the construction, utility, and advantages of thisinvention will now beapparent to those skilled in this art withouta moredetailed description thereof. The present embodiment of the inventionhas been disclosed in detail merely by way of example since. in actualpractice it attains the features of advantage enumerated as desirable inthe statement of the invention and the above description. It will beapparent that after changes in the details of construction, and in thecombination and arrange ment oit parts may be resorted to withoutdeparting from the spirit or scope of the invention as hereinafterclaimed or sacrificing;r any of its advantages. Y

Having thus described our invention what we claim as new is:

l. A boiler ot the class described including, in combination, afir-eben, a flue pipe extending from the fire-box, a tube within thepipe, a drum within the fire-box, means about the drum and about thetube for causing the products ot combustion to rise in a spiral path,said means comprising,- a spirally arranged iin, and a plurality of ribsbetween the tins, said ribs being` circumferentially disposed about thedrum and tube.

2. A boiler ot the class described including, in combination, a{ire-box, a flue pipe extending from the fire-box, a tube within thepipe, a drum within the i'ebox, means about the drum and about the tubefor cans" ingl the products of combustion to rise in a spiral path, saidmeans comprising a spifrally arranged iin, and a plurality o1 ribsbetween the fins, said ribs being circumferentially disposed about thedrum and tube, the bottom end of the drum being' of an invertedcone-shaped tor-mation.

3. A ldiffuser of the character described including` a drum, a tuberising` from the ing spiral pathways, and spiral fins in said Ypathways.

L. A diffuser 0iI the character described including a drum, a tuberising` from the tube coaxially therewith, a plurality of annular ribsabout the drum and about thev tube, said ribs being,l formed in spacedsections,y Ithe spaces between the sections torining; spiral pathways,and spiral fins in said pathways, the width ot' the iins being greaterthan the width orp the ribs. a

5. A diii'user of the character described includinfo)I a drum, a tuberising from the tube co-aXi-ally therewith, a plurality of annular ribsabout the drum and about the tube, said ribs being Jformed in spaced'Vsections, the spaces between the sections forming,` spiral pathways, andspiral fins in said pathways, the width ot the tins being greater thanthe width of the ribs, the spiral ot the drum being; in an oppositedirection from that of the tube.

In testimony whereof they aiiix their signatures.

Y CLARENCE H. Haas. Lewis J. MITCHELL,

